Pulverizing-mill



(No Model.)

B. FORBES.

PULVERIZING MILL.

No. 342,506. Patented May 25, 1886:

N PEYER8. Phulo-Lilhognphur. Wuhi nnnn 4C.

UNITED STATES PAT NT OFFICE.

ROBERT FORBES, OF DOWVNIEVILLE, CALIFORNIA.

PULVERlZlNG-MILL.

SPECIFICATION forming part of Letters Application filed November 2.1885.

To all whom it may concern..-

Be it known that I, ROBERT FORBES, of Downieville, Sierra county, StateofGalifornia, have invented an Improvement in Pulverizing- Mills; and Ihereby declare the following to be a full, clear, and exact descriptionof the same.

My invention relates to that class of pulverizing-mills in which aneccentrically moving or wabbling muller operates in an annular space ina pan or vessel and around a central guiding-core, and my pulverizingmill coniprises a shoe for the central core, a directingiiange aroundthe exterior of the pan adapted to convey the screened material into anunderlying circularorannular discharge-trough, means for securing theparts of the sectional screen together and to the pan, a hopper for themuller, a shield for the top of the screen, and in removablewearing-blocks for the inner surfaces of the shoes of the annularmuller, all of which I shall hereinafter fully describe and claim.

The object of my invention is, by the use of the various improvements Ihave made, to render more perfect a machine of this class.

Referring to the accompanying drawing, the figure is a vertical sectionof my pulverizing-mill.

A is the framework of the machine.

B is a pan orvessel having slopingsides and a central conical core, b,by which is formed an annular or ring-shaped space, in which are seatedthe removable dies 0.

D is the sectional screen secured to and continuing the inclination ofthe sides of the pan. On the rim of the pan is an exterior flange, E,under which is an annular discharge-trough, F, set on an angle. 7

H is the muller, made of an annular shape and provided with shoes h. Themuller is secured by a spider, i, to a shaft, I, the upper end of whichis eccentrically connected with a crank-shaft, J, whereby the muller hasimparted to it a wabbling or eccentric motion within the pan and aroundthe central core. The muller is provided with a hopper, K, and over theedge of said hopper, and fitting snugly upon or within the top of thescreen, is an annular shield, L. This screen L is made preferably in theform of a truncated cone, its

Patent NO. 342,506, dated May 25, 1886.

Serial No. 181,725. (No model.)

central opening being somewhat smaller than the diameter of the upperportion of the hopper, whereby all liability of the ore falling betweenthe screens and muller is avoided. Around the central core is an annularshoe, 1/, which may be readily put in place and removed by any suitablemeans, as, for example, by the slots b in its innersurface engaging thepins or studs 1) in the central core. On the inner surfaces of themuller-shoes are the wearing-blocks h, which are adapted'to be renewedwhen necessary. being set therein in any suitable man ner, preferablydovetailed.

The screen-sections are secured to the pan and to each other in thefollowing manner: Upon the flange E are cast lugs e, opposite the pointsof meeting of the screen-sections. \Vedges e are driven in between theouter surfaces of the bases of the screen-sections and these lugs,whereby said sections are forced against the exterior surface of the panwhile resting upon the flange E. The tops of the sections are secured bystaples e", driven down over lugs 0 cast on the meeting edges of thescreen-sections.

The operation of the machine is as follows: The annular muller fits downinto the annular space of the pan, and the material to be crushed is fedinto the hopper K ,of said muller and passes down through it, finallyworking its way between the shoes and dies. The shield L, by extendingover the hopper, as shown, prevents any material from getting downbetween the periphery of the muller and the screen-sections. The mulleris given an cecentric or wabbling motion by means of the crank-shaft Jabove, and it is guided in this motion about the central core, I), ofthe pan.

As considerable wear occurs between the inner surface of the muller andthe central core, it is necessary to provide the latter with a shoe ofsome kind. This has been done heretofore by independent blocks, whichare separated from each other and serve also to center the muller. Ihave found that in using said blocks the material is apt to get betweenthem in rather large pieces, which are not crushed. I have thereforediscarded the blocks and use a continuousring shoe, such as I havedescribed, which effectually serves to protect the central core, guidesthe muller as well,

and acts as a perfect crushing-surface. The wearing-blocks h on theinner surfaces of the muller-shoes provide for the wear on this portionof the muller, which takes place between the shoes and the central core.

The means for securing the screen-sections together are simple andefiective, providing for the ready removal and renewal of any section.The flange E directs the material discharged from the pan into thetrough below. The hopper of the muller properly directs the material fedto the machine and prevents any waste. J

Having thus described my invention,what I claim as new, and desire tosecure by Letters Patent, is

1. A pulverizing-mill comprising the pan B, having a central coreforming with the sides thereof an annular space, suitable dies in saidspace, the sectional screens D, secured to and forming a continuation ofthe sides of the pan, the annular eccentrically moving or wabblingmuller H, suitable shoes secured thereto, the hopper K on top of themuller, and the shield L, substantially as herein described.

2. A pulverizing-mill comprising the pan or vessel B, having an exteriorflange, E, the eccentrically moving or wabbling muller H, the sectionalscreen D, secured to and forming on the flange and the wedges 6, hearingbetween said lugs and the meeting edges of the sections of the screen,thelugs e"on the screensections and the staples 6 binding on said lugs,substantially as herein described.

3. A pulverizing-mill comprising the pan or vessel B, having a centralcore, I), provided with an annular or ring shoe, 6, the dies Oin thepan, the flange E around its exterior, the trough F under the flange.the sectional screen D, secured to the sides of the pan by wedges andstaples, as described, the muller H, provided with shoes 72, havingWearingblocks h on their inner surfaces, the hopper K on the 1nu1ler,the shield L, and the means for imparting a wabbling motion to saidmuller, consisting of the shaft I, connected with the muller, and thecrank-shaft, J, connected with the shaft I, all arranged and adapted tooperate substantially as herein described.

In witness whereof I have hereunto set my hand.

ROBERT FORBES. Witnesses:

S. H. NOURsE,

H. 0. LEE.

